| 马利平,侯精明,张大伟,夏军强,李丙尧,宁利中.耦合溃口演变的二维洪水演进数值模型研究[J].水利学报,2019,50(10):1253-1267 |
| 耦合溃口演变的二维洪水演进数值模型研究 |
| Study on 2-D numerical simulation coupling with breach evolution in flood propagation |
| 投稿时间：2019-07-01 |
| DOI：10.13243/j.cnki.slxb.20190462 |
| 中文关键词: 溃坝 数值模拟 溃口演变 洪水演进 堰塞坝 |
| 英文关键词: dam break numerical simulation breach evolution flood propagation landslide dam |
| 基金项目:国家自然科学基金重点项目（41731289）；陕西省国际科技合作交流计划项目（2017KW-014）；陕西省水利科技项目（2017slki-14）；水资源与水电工程科学国家重点实验室（武汉大学）开放基金（2016HLG01） |
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| 摘要点击次数: 1840 |
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| 中文摘要: |
| 为更好地模拟溃坝洪水过程，本文采用源项法耦合了溃口演变模型DB-IWHR与基于GPU加速技术的二维水动力模型，建立了一个包含上游库区二维水动力过程、溃口演变和下游淹没区二维洪水演进的高性能耦合模型。模型中所用源项法为在同一时间步长内，通过二维浅水方程的源项将溃口演变模型计算的流量转换为二维水动力模型溃口上下游各标记网格水深的变化值，以此来实现溃口上下游之间的水量交互。该模型的优势在于所用源项法简单易实现，充分考虑溃口的冲刷过程及上下游水动力过程，同时引入GPU技术加速计算。最后，将耦合模型应用于一个土石坝和两个堰塞坝溃决算例，所得结果与实测吻合较好，模型运行快速高效，这表明基于源项法的耦合模型可实现对土石坝、堰塞坝溃坝等灾害事故的合理高效预测，为应急抢险工作提供有力支撑。 |
| 英文摘要: |
| In order to simulate better the process of dam break and flood propagation, the source term method is used to couple the breach evolution model with a GPU accelerated 2-D hydrodynamic model. A high-performance coupling model are established which includes the 2-D hydrodynamic processing in upstream reservoir area, the breach evolution and the 2-D flood propagation in downstream floodplain. The source term method can be described that the discharge, calculated by the breach evolution model, is converted into the variation value of water depth in each marked grid in the upstream and downstream of the breach at the same time step of the coupling model. Indeed, the interaction of water volume between the upstream and downstream is obtained. The advantage of this model is that the method is simple to implement, the completely breach evolution process is considered, and the comprehensive consideration in hydrodynamic process in upstream and downstream, in addition, GPU technique is used to accelerate the model efficiency. Finally, the coupling model is applied to simulate the dam break processing in an earth-rock dam and two landslide dams. The results show in good agreement with measured data, the coupling model runs more quickly and efficiently. It indicates that the coupling model based on the source term method can bring reasonable and efficient prediction for disasters of dam break in earth-rock dams and landslide dams. It will provide a powerful support for the work of emergency and rescue. |
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